My daughter wants me to build a new fence.

She has 2 boxers and they keep knocking out fence planks.

She has one of those "alternating wood fences" where there are alternating fence planks on her side and on the neighbors sides.

I would prefer to not have to take down the old fence.

thanks for your ideas. :-)

Andy

Screws.

Or a new fence but I think you want option 1

Sell the boxers. Get chihuahuas.

The reason they're knocking out the planks is the obvious, they alternate and the dogs can get in there with their snouts and paws. But you know that.

No taking down the old fence means? Not taking out the poles?

A thing to do is go pure stockade style which is not alternating planks, not picket style, but all the planks on one side, and no gaps. Visually outside the property, people tend to put the planks on the outside so it looks appealing, however for this case I'd recommend putting the planks on the inside because the dogs could only press against them and that would tend to do no harm because they'd be pressing against a solid surface. A further option would be to plank both sides with no gaps. You get a good look externally and protection internally. Note my point that planking just the outside means the dogs could strike outward and thus dislodge planks, so not a solution I'd recommend.

People put planks normally up/down, but I've seen them sideways too.

I have a coworker who breeds Rhodesian ridgebacks, they are a large, happy, but active breed. He dug down like 2+ feet, put in concrete blocks, plus an electrified screen, and then put a big stockade fence above all that. The dogs dig, but encounter concrete and get shocked if they really try, and they do. Ultimately they can't get out. I think he went over 6' in height too.

It's all a combination of how much money you want to spend, or can afford, plus aesthetics which are agreeable to the owners. And sometimes also whether or not local regs or neighbors will complain about severe fencing. My coworker lives out in the boonies, even though the dog enclosure is huge, it's still not anywhere near his entire property. Plus, no neighbors really can see, nor care. Instead they're probably happy that his dogs don't get out at random, inconvenient intervals.

Train the owner.
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.
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Then smooth off any rough edges of the dog(s).

But start at the beginning.

Don't try to make the planks impregnable.

Mount wire fencing like this on the inside of the fence so the dogs can't get to the pickets/planks. You can get such fencing coated in dark green plastic so that it's hardly visible from more than three feet away.

Worked for my Labrador. Of course, he could have jumped my fence, but he never thought of trying that.

I would also politely suggest that a battery-powered electric fence (one or several wires, as needed) will very quickly ... and, harmlessly ... get the necessary point across to the dogs.

Attach the wires with bright yellow insulators along the fence. (The insulators serve as a visual reminder.)

An electric fence charges a capacitor with very high voltage but almost no actual current (amperage). It's like a swat on the nose with a small switch. ("Woof?! WTF?!") The dogs will jump back in surprise, probably repeat the encounter a few times, and most likely the lesson will be learned, because the negative reinforcement is administered instantly.

The type of fence-charger that is used for cattle is an unnecessary expense, as are the "wireless" gadgets sold in pet stores. Go to a farm store, e.g. Tractor Supply (in the southeast US). The lowest-voltage battery powered unit will do nicely. Uhh, the "lowest-voltage unit" that I found there, albeit battery-powered, could drive a current two miles. Far more than you need. But a Google search for a unit designed to protect a garden looked fine. You simply want "a gentle, but immediate, 'swat on the nose.'" And then, only for half-a-dozen times or so.

Leave the yellow-posted wires in place permanently. Dogs are smart, and they are also very visual.

This may be the answer. :-)

https://www.youtube.com/watch?v=oscGfKAQDag

Maybe modify it so it cleans up their poop.